Modders BlendArt and Kolchozník jr come up with a pretty cool round bale transport trailer. The loading is done telescopically on the side. The bales are stored on the rolling side, which will allow unloading, via a tilting system, to deposit the bales. It's well thought out, but be careful to unload on flat ground, at the risk of seeing your cargo spoil. Small detail that is important, it is on a truck that it will be necessary to hitch this trailer.